[jQuery] Appending to a static string

[Scott Haneda]

Hello, as an example, https://twitter.com/signup when you enter in a  
username, a static string of "Your URL: http://twitter.com/USERNAME";  
has the USERNAME replaced with what you are typing in.

This is day one of JQ for me. I was looking at the onkeyup event in JS  
in general, but I figure it is time for me to learn JQ.

I am pretty sure I am going to
   <script type="text/javascript">
     $(document).ready(function(){
        // something fancy here
     });

html...
<div>
        Your URL: http://example.com/USERNAME
<div>

Any help is appreciated.
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